CN105522356A - Crankshaft machining method - Google Patents

Abstract

The invention relates to the machining field, in particular to a crankshaft machining method. The crankshaft machining method comprises the steps of blank selecting and machining, wherein die forging is adopted because the batch of parts is large and the requirement for the mechanical property of crankshafts is high; milling and drilling, wherein a special machine tool clamp is adopted on a milling and drilling machine for clamping work-pieces and carrying out end face milling and center drilling, the production speed can be greatly increased, and mass production of the crankshafts is easy; tempering, wherein tempering belongs to the preheat treatment and is generally carried out after rough turning and before semi-finish turning, the comprehensive mechanical property of the crankshafts can be high, the bending moment and deformation resistance of the crankshafts in transmission can be improved, and the rigidity of the crankshafts can meet the requirement of 230-250 HBS after tempering, quenching and high-temperature tempering; turning, wherein turning is the most basic method for rough machining and semi-finish machining of outer cylindrical surfaces because the eccentric distance is large; quenching; center hole polishing; milling; grinding. According to the invention, the machining process is simple, manufacturing is easy, the machining quality and the dimensional accuracy of the work-pieces can be guaranteed, the production efficiency can be improved, and the production cost can be lowered.

Description

Method for processing crankshaft

Technical field

The present invention relates to field of machining, be specifically related to method for processing crankshaft.

Background technology

In many machines, crankshaft type part is mainly used to supporting driving parts, transmits motion and moment of torsion.The crudy of bent axle and dimensional accuracy, the direct safe operation affecting equipment or device, but how effectively to ensure the machining accuracy of crankshaft type part and to cut down finished cost, how using suitable processing method to go to solve the basic technology problem in actual production neatly, is the difficult problem that vast processing enterprise faces always.

Summary of the invention

In order to solve the problem, the invention provides a kind of process simple, be easy to manufacture, and crudy and the dimensional accuracy of workpiece can be ensured, enhancing productivity, reducing the method for processing crankshaft of production cost.

Method for processing crankshaft of the present invention, comprises the following steps:

The first step, the selection of blank and processing, because this parts batch is large and require that bent axle should have good mechanical property, adopt die forging;

Second step, milling is bored, and milling and drilling machine adopts special jig clamping workpiece carry out, in end face milling brill, greatly to improve speed of production, is conducive to the production in enormous quantities of bent axle;

3rd step, modified, modifiedly belong to conditioning treatment, modifiedly generally be arranged in rough turn with before later half finish turning, make bent axle have high comprehensive mechanical property, the ability such as bending resistance square distortion when improving its transmission, through modified, after quenching, high tempering, its hardness should reach 230 ~ 250HBS requirement;

4th step, turning, turning is the most basic skills of thick, semifinishing external cylindrical surface, and because eccentric throw is comparatively large, turning need be carried out with Special lathe clamp in eccentric position, to ensure the machining accuracy of workpiece;

5th step, quenching, the selective hardening of two support axle journals and eccentric cylinder face portion is to obtain required case hardness, namely its wearability is strengthened, improve the service life of bent axle, after quenching, its hardness should reach 45 ~ 52HRC requirement, quenching belongs to finished heat treatment, before generally coming grinding process, quenching position needs to remove its quenching distortion with grinding, thus ensures the crudy of bent axle;

6th step, repair center lapping, ensure that centre bore axis the overlap cone angle of centre bore in two ends is wanted accurately, it is wanted greatly with top contact area, and surface roughness is little, otherwise be clamped in two top bent axles of asking, in process, deviation from circular from appearred in the change because of contact stiffness, ensure the quality of two ends centre bore, after the heat treatment, before grinding, should arrange to repair center lapping operation, to eliminate error;

7th step, milling, cylindrical keyway is everlasting milling on vertical knee-type milling machine; Inner hole key slot is everlasting slotting on slotting machine, then arranges as far as possible backward, after generally should being placed on outer circle finish turning, carries out before fine grinding, can ensure the continuous cutting of finish turning like this, do not produce vibration and not fragile cutter to the processing in non-hardenable minor surface;

8th step, grinding, cylindricalo grinding is the most basic skills on the fine finishining face of cylinder, should take good cooling provision during grinding.

Process of the present invention is simple, is easy to manufacture, and can ensure crudy and the dimensional accuracy of workpiece, enhances productivity, and reduces production cost.

Detailed description of the invention

Method for processing crankshaft of the present invention, comprises the following steps:

The first step, the selection of blank and processing, because this parts batch is large and require that bent axle should have good mechanical property, adopt die forging;

Second step, milling is bored, and milling and drilling machine adopts special jig clamping workpiece carry out, in end face milling brill, greatly to improve speed of production, is conducive to the production in enormous quantities of bent axle;

3rd step, modified, modifiedly belong to conditioning treatment, modifiedly generally be arranged in rough turn with before later half finish turning, make bent axle have high comprehensive mechanical property, the ability such as bending resistance square distortion when improving its transmission, through modified, after quenching, high tempering, its hardness should reach 230 ~ 250HBS requirement;

4th step, turning, turning is the most basic skills of thick, semifinishing external cylindrical surface, and because eccentric throw is comparatively large, turning need be carried out with Special lathe clamp in eccentric position, to ensure the machining accuracy of workpiece;

5th step, quenching, the selective hardening of two support axle journals and eccentric cylinder face portion is to obtain required case hardness, namely its wearability is strengthened, improve the service life of bent axle, after quenching, its hardness should reach 45 ~ 52HRC requirement, quenching belongs to finished heat treatment, before generally coming grinding process, quenching position needs to remove its quenching distortion with grinding, thus ensures the crudy of bent axle;

6th step, repair center lapping, ensure that centre bore axis the overlap cone angle of centre bore in two ends is wanted accurately, it is wanted greatly with top contact area, and surface roughness is little, otherwise be clamped in two top bent axles of asking, in process, deviation from circular from appearred in the change because of contact stiffness, ensure the quality of two ends centre bore, after the heat treatment, before grinding, should arrange to repair center lapping operation, to eliminate error;

7th step, milling, cylindrical keyway is everlasting milling on vertical knee-type milling machine; Inner hole key slot is everlasting slotting on slotting machine, then arranges as far as possible backward, after generally should being placed on outer circle finish turning, carries out before fine grinding, can ensure the continuous cutting of finish turning like this, do not produce vibration and not fragile cutter to the processing in non-hardenable minor surface;

8th step, grinding, cylindricalo grinding is the most basic skills on the fine finishining face of cylinder, should take good cooling provision during grinding.

Process of the present invention is simple, is easy to manufacture, and can ensure crudy and the dimensional accuracy of workpiece, enhances productivity, and reduces production cost.

Claims (1)

1. a method for processing crankshaft, is characterized in that, comprises the following steps:

The first step, the selection of blank and processing, because this parts batch is large and require that bent axle should have good mechanical property, adopt die forging;

Second step, milling is bored, and milling and drilling machine adopts special jig clamping workpiece carry out, in end face milling brill, greatly to improve speed of production, is conducive to the production in enormous quantities of bent axle;

3rd step, modified, modifiedly belong to conditioning treatment, modifiedly generally be arranged in rough turn with before later half finish turning, make bent axle have high comprehensive mechanical property, the ability such as bending resistance square distortion when improving its transmission, through modified, after quenching, high tempering, its hardness should reach 230 ~ 250HBS requirement;

4th step, turning, turning is the most basic skills of thick, semifinishing external cylindrical surface, and because eccentric throw is comparatively large, turning need be carried out with Special lathe clamp in eccentric position, to ensure the machining accuracy of workpiece;

5th step, quenching, the selective hardening of two support axle journals and eccentric cylinder face portion is to obtain required case hardness, namely its wearability is strengthened, improve the service life of bent axle, after quenching, its hardness should reach 45 ~ 52HRC requirement, quenching belongs to finished heat treatment, before generally coming grinding process, quenching position needs to remove its quenching distortion with grinding, thus ensures the crudy of bent axle;

6th step, repair center lapping, ensure that centre bore axis the overlap cone angle of centre bore in two ends is wanted accurately, it is wanted greatly with top contact area, and surface roughness is little, otherwise be clamped in two top bent axles of asking, in process, deviation from circular from appearred in the change because of contact stiffness, ensure the quality of two ends centre bore, after the heat treatment, before grinding, should arrange to repair center lapping operation, to eliminate error;

7th step, milling, cylindrical keyway is everlasting milling on vertical knee-type milling machine; Inner hole key slot is everlasting slotting on slotting machine, then arranges as far as possible backward, after generally should being placed on outer circle finish turning, carries out before fine grinding, can ensure the continuous cutting of finish turning like this, do not produce vibration and not fragile cutter to the processing in non-hardenable minor surface;

8th step, grinding, cylindricalo grinding is the most basic skills on the fine finishining face of cylinder, should take good cooling provision during grinding.